This mod is as powerful as important to use properly.It's easy to install, but local testing is advised.As it is possible that some mods won't work properly at first, after install.If a mod added a GET or POST var on index.php, viewforum.php, viewtopic.php or a member's profile, it's URLs will most likely (for sure when running in strict mode) be redirected at first.

It's simple to fix, we just need to allow this additional var in our dupe filters.Please ask for support on such experiences.

Settings :

This mod is fully configurable using the phpBB SEO setting page.The setting pages will allow you to Set up the various zero duplicate features such as:

Activate the Zero duplictate (optional):

Allow to activate and desactivate the Zero duplicate redirections.Off is default, so you need to update at least this option to start seeing some redirections.

Strict Mode (optional):

When activated, the zero dupe will check if the requested URL exactly matches the one attended.When set to no, the zero dupe will make sure the attended url is the fist part of the one requested.The interest is to make it easier to deal with mods that could interfere with the zero dupe by adding GET vars.

Posts Redirections (optional):

This option will determine how to handle post urls; it can take four values :

'off' : do not redirect post url, whatever the case,

'post' : only make sure postxx.html is used for a post url,

'guest' : redirect guests if required to the corresponding topic url rather than to the postxx.html, and only make sure postxx.html is used for logged users,

'all' : redirect if required to the corresponding topic url.

If you redirect postxx.html to the corresponding topic URL in all cases, this as well mean that a message that would be posted in a thread and then moved in another one will see it's url changing, which thanks to the zero duplicate mod is of no harm SEO wise, but the previous link to the post won't link to it anymore in such case.

Then of course, better can be better.

Migrating :

If your forum was previously indexed using a different URL standad than the one you now plan to use, please read carefully the third part ( "3) Migrating :" ) of the first :

Once installed this mod, you should check, using for example http://web-sniffer.net/ , if the returned headers are correct.The mod should work nicely with apache and IIS server (running isapi_rewrite), but could under some circumstances output a 302 header instead, which is really not a good idea.So you should check if HTTP 301 header is returned with both options for gun-zip support.To do this, just paste a forum url with a miss-spelled title in URL in http://web-sniffer.net/And test BOTH OPTIONS for "Accept-Encoding: gzip"